package com.heima.comment.service.impl;

import java.util.*;
import java.util.stream.Collectors;

import com.alibaba.fastjson.JSON;
import com.heima.aliyun.scan.GreenScan;
import com.heima.aliyun.scan.ScanResult;
import com.heima.comment.service.CommentHotService;
import com.heima.comment.service.CommentService;
import com.heima.common.article.HotArticleConstants;
import com.heima.common.exception.CustException;
import com.heima.feigns.UserFeign;
import com.heima.model.comment.dtos.CommentDTO;
import com.heima.model.comment.dtos.CommentLikeDTO;
import com.heima.model.comment.dtos.CommentSaveDTO;
import com.heima.model.comment.pojos.ApComment;
import com.heima.model.comment.pojos.ApCommentLike;
import com.heima.model.comment.vos.ApCommentVo;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.mess.app.NewBehaviorDTO;
import com.heima.model.threadlocal.AppThreadLocalUtils;
import com.heima.model.user.pojos.ApUser;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections.CollectionUtils;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Service;


@Service
@Slf4j
public class CommentServiceImpl implements CommentService {
    @Autowired
    GreenScan greenScan;
    @Autowired
    UserFeign userFeign;
    @Autowired
    MongoTemplate mongoTemplate;
    @Autowired
    CommentHotService commentHotService;
    @Autowired
    RabbitTemplate rabbitTemplate;
    /**
     * 保存评论
     * @return
     */
    @Override
    public ResponseResult saveComment(CommentSaveDTO dto) throws Exception {
        //1. 校验参数
        //   校验文章id   校验内容不为空  校验内容长度不能大于140个字符 (validated校验)
        //   校验是否登录
        ApUser user = AppThreadLocalUtils.getUser();
        if (user == null){
            CustException.cust(AppHttpCodeEnum.NEED_LOGIN);
        }
        //2. 阿里云校验评论内容是否违规
        //        过滤掉违规词汇：替换为**
        ScanResult scanResult = greenScan.greenTextScan(dto.getContent());
        String filteredContent = scanResult.getFilteredContent();
        //3. 远程查询当前登陆用户信息
        ResponseResult<ApUser> userResult = userFeign.findUserById(user.getId());
        if (userResult.getCode().intValue()!=0) {
            CustException.cust(AppHttpCodeEnum.REMOTE_SERVER_ERROR,userResult.getErrorMessage());
        }
        user = userResult.getData();
        if (user==null) {
            CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST,"未查询到相关的用户信息");
        }
        //4. 创建评论信息，并保存到mongo
        ApComment apComment = new ApComment();
        apComment.setAuthorId(user.getId());
        apComment.setAuthorName(user.getName());
        apComment.setArticleId(dto.getArticleId());
        apComment.setType((short)0);
        if (filteredContent==null){
            apComment.setContent(dto.getContent());
        }else {
            apComment.setContent(filteredContent);
        }
        apComment.setImage(user.getImage());
        apComment.setLikes(0);
        apComment.setReply(0);
        apComment.setFlag((short)0);
        apComment.setCreatedTime(new Date());
        apComment.setUpdatedTime(new Date());
        mongoTemplate.insert(apComment);

        //发送评论行为消息，用于修改文章行为汇总数量，更改文章热度
        NewBehaviorDTO mess = new NewBehaviorDTO();
        mess.setType(NewBehaviorDTO.BehaviorType.COMMENT);
        mess.setArticleId(dto.getArticleId());
        mess.setAdd(1);
        rabbitTemplate.convertAndSend(HotArticleConstants.HOT_ARTICLE_SCORE_BEHAVIOR_QUEUE, JSON.toJSONString(mess));
        log.info("评论行为 发送消息 ==>{}",JSON.toJSONString(mess));
        return ResponseResult.okResult();
    }

    @Autowired
    RedissonClient redissonClient;
    /**
     * 点赞评论
     * @param dto
     * @return
     */
    @Override
    public ResponseResult like(CommentLikeDTO dto) {
        //1. 参数校验  评论id不能为空  operation必须为 0  或  1  是否登录
        ApUser user = AppThreadLocalUtils.getUser();
        if (user==null) {
            CustException.cust(AppHttpCodeEnum.NEED_LOGIN);
        }

        //加锁
        RLock lock = redissonClient.getLock("likes-lock");
        //2. 根据评论id查询评论数据， 为null返回错误信息
        lock.lock();
        ApComment apComment;
        try {
            apComment = mongoTemplate.findById(dto.getCommentId(), ApComment.class);
            if (apComment==null) {
                CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST,"未发现评论信息");
            }
            //3. 如果是点赞操作 判断是否已经点赞
            int operation = dto.getOperation().intValue();
            Query query = Query.query(Criteria.where("authorId").is(user.getId()).and("commentId").is(dto.getCommentId()));
            if (operation==0){
                //   点过赞提示 请勿重复点赞
                ApCommentLike apCommentLike = mongoTemplate.findOne(query, ApCommentLike.class);
                if (apCommentLike!=null){
                    CustException.cust(AppHttpCodeEnum.DATA_EXIST,"请勿重复点赞");
                }
                //   未点过赞   保存点赞信息到mongo
                apCommentLike = new ApCommentLike();
                apCommentLike.setAuthorId(user.getId());
                apCommentLike.setCommentId(dto.getCommentId());
                apCommentLike.setOperation((short)0);
                mongoTemplate.save(apCommentLike);
                //   并修改评论信息的点赞数量( + 1)
                apComment.setLikes(apComment.getLikes() + 1);
                mongoTemplate.save(apComment);

                //计算热点评论
                if (apComment.getLikes() >= 10 && apComment.getFlag() == 0){
                    commentHotService.hotCommentExecutor(apComment);
                }
            }else {
                //4. 如果是取消点赞操作 删除点赞信息
                mongoTemplate.remove(query,ApCommentLike.class);
                // 并修改评论信息的点赞数量( - 1) , 要判断下别减成负数
                apComment.setLikes(apComment.getLikes() < 1 ? 0 : apComment.getLikes() - 1);
                mongoTemplate.save(apComment);
            }
        } finally {
            //解锁
            lock.unlock();
        }
        //5. 返回结果时，需要返回点赞数量  返回的key要求必须是:  likes
        Map map = new HashMap<>();
        map.put("likes",apComment.getLikes());
        return ResponseResult.okResult(map);
    }

    /**
     * 根据文章id查询评论列表
     * @return
     */
    @Override
    public ResponseResult findByArticleId(CommentDTO dto) {
        //1. 参数校验 校验文章id 校验size 最小时间
        if (dto.getMinDate() == null){
            dto.setMinDate(new Date());
        }
        Integer size = dto.getSize();
        if (size == null || size <= 0) {
            size = 10;
        }
        //2. 根据条件查询评论列表
        List<ApComment> apCommentList;
        // 文章评论的首页
        if (dto.getIndex().intValue() == 1) {
            //查询热点评论  5
            Query query = Query.query(Criteria.where("articleId").is(dto.getArticleId()).and("flag").is(1)).with(Sort.by(Sort.Direction.DESC, "likes"));
            apCommentList = mongoTemplate.find(query, ApComment.class);
            // 热点集合不为空
            if (CollectionUtils.isNotEmpty(apCommentList)) {
                size = size - apCommentList.size();
                List<ApComment> normalComments = mongoTemplate.find(getQuery(dto, size), ApComment.class);
                apCommentList.addAll(normalComments);
            } else {
                apCommentList = mongoTemplate.find(
                        getQuery(dto, size),
                        ApComment.class
                );
            }
        } else {
            apCommentList = mongoTemplate.find(
                    getQuery(dto, size),
                    ApComment.class
            );
        }

        //3. 判断当前用户是否登录
        //4. 如果未登录直接返回评论列表
        ApUser user = AppThreadLocalUtils.getUser();
        if (user == null || CollectionUtils.isEmpty(apCommentList)){
            return ResponseResult.okResult(apCommentList);
        }

        //5. 如果登录了 需要检查在当前评论列表中 哪些评论登陆人点赞过 (将所有ApComment 转成 ApCommentVO , 点过赞的operation设置为0)
        List<String> commentIdList = apCommentList.stream().map(ApComment::getId).collect(Collectors.toList());
        //   推荐实现:
        //   5.1 根据当前列表中评论id  和  登录人id 查询评论点赞表，得到点赞数据
        //                 commentId  in    评论id列表   authorId = 登录人id
        Query query1 = Query.query(Criteria.where("commentId").in(commentIdList).and("authorId").is(user.getId()));
        List<ApCommentLike> apCommentLikes = mongoTemplate.find(query1, ApCommentLike.class);
        List<ApCommentVo> commentVoList = new ArrayList<>();
        //获取点赞记录中，所有评论的id
        List<String> likeCommentIds = apCommentLikes.stream().map(ApCommentLike::getCommentId).distinct().collect(Collectors.toList());
        //   5.2 遍历评论列表
        apCommentList.forEach(apComment -> {
            // 将每一个评论  ApComment 转成 ApCommentVO
            ApCommentVo apCommentVo = new ApCommentVo();
            BeanUtils.copyProperties(apComment,apCommentVo);
            // 其中  如果当前评论id在点赞记录中存在  设置operation字段为0  不存在不用做任何处理
            if (likeCommentIds.contains(apComment.getId())){
                apCommentVo.setOperation((short) 0);
            }
            commentVoList.add(apCommentVo);
        });
        return ResponseResult.okResult(commentVoList);
    }

    /**
     * 构建查询条件
     */
    private Query getQuery(CommentDTO dto, Integer size) {
        return Query.query(Criteria.where("articleId").is(dto.getArticleId())
                        .and("flag").is(0).and("createdTime").lt(dto.getMinDate()))
                .limit(size).with(Sort.by(Sort.Direction.DESC, "createdTime"));
    }
}
